Programmable logic controller



FIG. 1 is a front elevational view of a programmable logic controller showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a front, left and bottom perspective view thereof; and,

FIG. 8 is a perspective view thereof as seen from the rear and upper right. 

The ornamental design for a programmable logic controller, as shown and described. 